[PATCH 5.2 025/124] mwifiex: Fix three heap overflow at parsing element in cfg80211_ap_settings

[Greg Kroah-Hartman]

From: Wen Huang <huangwen...@gmail.com>

commit 7caac62ed598a196d6ddf8d9c121e12e082cac3a upstream.

mwifiex_update_vs_ie(),mwifiex_set_uap_rates() and
mwifiex_set_wmm_params() call memcpy() without checking
the destination size.Since the source is given from
user-space, this may trigger a heap buffer overflow.

Fix them by putting the length check before performing memcpy().

This fix addresses CVE-2019-14814,CVE-2019-14815,CVE-2019-14816.

Signed-off-by: Wen Huang <huangwen...@gmail.com>
Acked-by: Ganapathi Bhat <gb...@marvell.comg>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/wireless/marvell/mwifiex/ie.c      |    3 +++
 drivers/net/wireless/marvell/mwifiex/uap_cmd.c |    9 ++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/marvell/mwifiex/ie.c
+++ b/drivers/net/wireless/marvell/mwifiex/ie.c
@@ -241,6 +241,9 @@ static int mwifiex_update_vs_ie(const u8
                }
 
                vs_ie = (struct ieee_types_header *)vendor_ie;
+               if (le16_to_cpu(ie->ie_length) + vs_ie->len + 2 >
+                       IEEE_MAX_IE_SIZE)
+                       return -EINVAL;
                memcpy(ie->ie_buffer + le16_to_cpu(ie->ie_length),
                       vs_ie, vs_ie->len + 2);
                le16_unaligned_add_cpu(&ie->ie_length, vs_ie->len + 2);
--- a/drivers/net/wireless/marvell/mwifiex/uap_cmd.c
+++ b/drivers/net/wireless/marvell/mwifiex/uap_cmd.c
@@ -265,6 +265,8 @@ mwifiex_set_uap_rates(struct mwifiex_uap
 
        rate_ie = (void *)cfg80211_find_ie(WLAN_EID_SUPP_RATES, var_pos, len);
        if (rate_ie) {
+               if (rate_ie->len > MWIFIEX_SUPPORTED_RATES)
+                       return;
                memcpy(bss_cfg->rates, rate_ie + 1, rate_ie->len);
                rate_len = rate_ie->len;
        }
@@ -272,8 +274,11 @@ mwifiex_set_uap_rates(struct mwifiex_uap
        rate_ie = (void *)cfg80211_find_ie(WLAN_EID_EXT_SUPP_RATES,
                                           params->beacon.tail,
                                           params->beacon.tail_len);
-       if (rate_ie)
+       if (rate_ie) {
+               if (rate_ie->len > MWIFIEX_SUPPORTED_RATES - rate_len)
+                       return;
                memcpy(bss_cfg->rates + rate_len, rate_ie + 1, rate_ie->len);
+       }
 
        return;
 }
@@ -391,6 +396,8 @@ mwifiex_set_wmm_params(struct mwifiex_pr
                                            params->beacon.tail_len);
        if (vendor_ie) {
                wmm_ie = vendor_ie;
+               if (*(wmm_ie + 1) > sizeof(struct mwifiex_types_wmm_info))
+                       return;
                memcpy(&bss_cfg->wmm_info, wmm_ie +
                       sizeof(struct ieee_types_header), *(wmm_ie + 1));
                priv->wmm_enabled = 1;